Adding Rational Numbers Fractions

The video tutorial explains how to add rational numbers, focusing on the rules for adding integers. It covers the process of adding numbers with the same and different signs, using examples with fractions. The tutorial demonstrates how to find a common denominator and determine the sign of the sum, concluding with a summary of the lesson.

What is the absolute value of -4/5 and how does it compare to 9/10?

What is the final result of adding -4/5 and 9/10, and how do you determine its sign?